I have formatted and installed windows so many times in the last few days due to some error or glitch. Sometimes the WIndows Start Menu won't open on pressing the Win key, other times many parts of control panel won't directly open give the error " The item you selected is unavailable it has been removed/moved/deleted" ,it is the same when trying to open powershell. Sfc/Scannow gives errors but can't fix them. Has windows always been so laggy.I even bought an oem to activate windows and now I will have to format it again. Any suggestions?